Preparation method of 4,4'-(Hexafluoroisopropylidene) diphthalic anhydride
A technology of hexafluoroisopropenylene and diphthalic anhydride, applied in 4 fields, can solve the problems such as the lack of effective guarantee of production safety, high reaction temperature, high reaction pressure and the like
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0021] 106g (1mol) o-xylene, 330g (1.5mol) 2,2-dichlorohexafluoropropane, AlCl 3 200g and 1300g 1-butyl-3-methylimidazoline tetrafluoroborate, heated to 85°C for 15 hours, cooled to 20°C, poured into 1500L water, extracted twice with 2000L toluene, dried with anhydrous magnesium sulfate, Filter, distill off the toluene, distill under a vacuum of 2 mmHg to obtain a crude product and recrystallize with isopropanol to obtain 150 g of 4,4'-(hexafluoroisopropenylene) di-o-xylene, with a yield of 83%. (Melting point: 78-80°C).
Embodiment 2
[0023] 106g (1mol) o-xylene, 330g (1.5mol) 2,2-dichlorohexafluoropropane, ZnCl 2 204g and 1300g 1-butyl-3-methylimidazoline tetrafluoroborate, heated to 85°C to react for 15 hours, cooled to 20°C, poured into 1500L water, extracted twice with 2000L toluene, dried with anhydrous magnesium sulfate, The toluene was distilled off by filtration, and the crude product was distilled under a vacuum of 2 mmHg to obtain 115 g of 4,4'-(hexafluoroisopropenylene) di-o-xylene by recrystallization from isopropanol, with a yield of 64%. (Melting point: 78-80°C).
Embodiment 3
[0025] 106g (1mol) o-xylene, 330g (1.5mol) 2,2-dichlorohexafluoropropane, AlCl 3 200g and 1300g of 1-butyl-3-methylimidazoline hexafluorophosphate, heated to 85°C for 15 hours, cooled to 20°C, poured into 1500L water, extracted twice with 2000L toluene, dried with anhydrous magnesium sulfate, filtered , The toluene was distilled off, and the crude product was distilled under a vacuum of 2 mmHg to obtain 61 g of 4,4′-(hexafluoroisopropenylene) di-o-xylene by recrystallization with isopropanol, with a yield of 34%. (Melting point: 78-80°C).
PUM
Property | Measurement | Unit |
---|---|---|
melting point | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com